Studies on Adsorption Kinetics of β-Cyclodextrin Modified Chitosan to Tannin and Pigment of Rosa roxburghii Tratt Juice
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    Abstract:

    In order to effectively remove the tannin and pigment present in Rosa roxburghii Tratt juice and improve its quality, three kinds of adsorbent including β-CS-CD, β-CD and CS were studied. Results showed that β-CS-CD exhibited the best absorption performance and the removal rate of pigment and tannin. Moreover, the absorption isotherm of β-CS-CD, β-CD and CS were fitted to the Langmuir and Freundlich equations. The linear correlation coefficients R2 were greater than 0.98. The pigment and tannin fitting parameter of Langmuir of β-CS-CD were qm=32.61 mg/g, 103×KL=52.85 L/mg, qm=22.37 mg/g, 103×KL=29.90 L/mg, respectively. The pigment and tannin fitting parameter of Freundlich of β-CS-CD were n=2.00, KF=3.611, n=1.18, KF=1.53, respectively. The results indicated that the introduction of β-CD functional group could greatly increase the adsorption efficiency. Kinetic studies showed that the adsorption was fast and the adsorption process followed a pseudo-first-order kinetic model. We also find that for β-CS-CD the adsorption kinetic rate constant (k2) value was much larger on β-CD and CS. These results clearly indicate that the introduction of CD increases not only the adsorption capacity and intensity but also the adsorption rate of chlorophenol. Therefore, β-CS-CD was effective to remove tannin and pigment from Rosa roxburghii Tratt juice and therefore could improve its quality.

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  • Online: December 02,2019
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